linux-kernel - Re: [PATCH v3 3/3] clk: nuvoton: Use clk_parent

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Date:   Tue, 27 Jun 2023 13:43:03 +0800
From:   Jacky Huang <ychuang570808@...il.com>
To:     Stephen Boyd <sboyd@...nel.org>, arnd@...db.de,
        gregkh@...uxfoundation.org, mturquette@...libre.com
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-clk@...r.kernel.org, soc@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, schung@...oton.com,
        Jacky Huang <ychuang3@...oton.com>
Subject: Re: [PATCH v3 3/3] clk: nuvoton: Use clk_parent_data instead of
 string for parent clock



On 2023/6/27 上午 12:09, Stephen Boyd wrote:
> Quoting Jacky Huang (2023-06-22 07:13:43)
>> From: Jacky Huang <ychuang3@...oton.com>
>>
>> For the declaration of parent clocks, use struct clk_parent_data instead
>> of a string. Due to the change in the passed arguments, replace the usage
>> of devm_clk_hw_register_mux() with clk_hw_register_mux_parent_data() for
>> all cases.
>>
>> Signed-off-by: Jacky Huang <ychuang3@...oton.com>
>> ---
>>   drivers/clk/nuvoton/clk-ma35d1.c | 306 ++++++++++++++++++++++---------
>>   1 file changed, 219 insertions(+), 87 deletions(-)
>>
>> diff --git a/drivers/clk/nuvoton/clk-ma35d1.c b/drivers/clk/nuvoton/clk-ma35d1.c
>> index 733750dda0f4..f1fe7edd21b5 100644
>> --- a/drivers/clk/nuvoton/clk-ma35d1.c
>> +++ b/drivers/clk/nuvoton/clk-ma35d1.c
>> @@ -63,167 +63,298 @@ static DEFINE_SPINLOCK(ma35d1_lock);
>>   #define PLL_MODE_SS             2
>>   
>>   static const struct clk_parent_data ca35clk_sel_clks[] = {
>> -       { .index = 0 },  /* HXT */
>> -       { .index = 1 },  /* CAPLL */
>> -       { .index = 2 }   /* DDRPLL */
>> +       { .fw_name = "hxt", },
>> +       { .fw_name = "capll", },
>> +       { .fw_name = "ddrpll", },
> Is there any reason why this changed from numbers to strings? It is
> faster to directly index vs. access the clock-names property. The
> preference is to use the index field and only use fw_name if we're
> migrating legacy clk drivers to use DT based lookups.

This is simply because I think strings are more readable than numbers.
Since using an index is the preferred method, I will change all occurrences
of ".fw_name" to ".index" and add comments to describe it.
As this patch was applied, I will create another patch relative to this one.


Best Regards,
Jacky Huang